Frequencies for first 10,000 rows of bdatefl variable in nhamcsopd2003 dataset :

was patient |
 birth date |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
not imputed |      9,763       97.63       97.63
    imputed |        237        2.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016